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| Rev 3836 | Rev 3837 | ||
|---|---|---|---|
| Line 40... | Line 40... | ||
| 40 | #include <arch.h> |
40 | #include <arch.h> |
| 41 | #include <print.h> |
41 | #include <print.h> |
| 42 | #include <symtab.h> |
42 | #include <symtab.h> |
| 43 | 43 | ||
| 44 | 44 | ||
| - | 45 | static unsigned int seed = 10; |
|
| - | 46 | static unsigned int seed_real __attribute__ ((section("K_UNMAPPED_DATA_START"))) = 42; |
|
| - | 47 | ||
| - | 48 | ||
| 45 | /** Try to find PTE for faulting address |
49 | /** Try to find PTE for faulting address |
| 46 | * |
50 | * |
| 47 | * Try to find PTE for faulting address. |
51 | * Try to find PTE for faulting address. |
| 48 | * The as->lock must be held on entry to this function |
52 | * The as->lock must be held on entry to this function |
| 49 | * if lock is true. |
53 | * if lock is true. |
| Line 123... | Line 127... | ||
| 123 | panic("%p: PHT Refill Exception at %p (%s<-%s).", badvaddr, |
127 | panic("%p: PHT Refill Exception at %p (%s<-%s).", badvaddr, |
| 124 | istate->pc, symbol, sym2); |
128 | istate->pc, symbol, sym2); |
| 125 | } |
129 | } |
| 126 | 130 | ||
| 127 | 131 | ||
| - | 132 | /** Pseudorandom generator |
|
| - | 133 | * |
|
| - | 134 | * A pretty standard linear congruential pseudorandom |
|
| - | 135 | * number generator (m = 2^32). |
|
| - | 136 | * |
|
| - | 137 | */ |
|
| - | 138 | #define RANDI(seed) \ |
|
| - | 139 | ({ \ |
|
| - | 140 | (seed) = 1103515245 * (seed) + 12345; \ |
|
| - | 141 | (seed); \ |
|
| - | 142 | }) |
|
| - | 143 | ||
| - | 144 | ||
| 128 | static void pht_insert(const uintptr_t vaddr, const pte_t *pte) |
145 | static void pht_insert(const uintptr_t vaddr, const pte_t *pte) |
| 129 | { |
146 | { |
| 130 | uint32_t page = (vaddr >> 12) & 0xffff; |
147 | uint32_t page = (vaddr >> 12) & 0xffff; |
| 131 | uint32_t api = (vaddr >> 22) & 0x3f; |
148 | uint32_t api = (vaddr >> 22) & 0x3f; |
| 132 | 149 | ||
| Line 178... | Line 195... | ||
| 178 | break; |
195 | break; |
| 179 | } |
196 | } |
| 180 | } |
197 | } |
| 181 | 198 | ||
| 182 | if (!found) |
199 | if (!found) |
| 183 | i = page % 8; |
200 | i = RANDI(seed) % 8; |
| 184 | } |
201 | } |
| 185 | 202 | ||
| 186 | - | ||
| 187 | - | ||
| 188 | phte[base + i].v = 1; |
203 | phte[base + i].v = 1; |
| 189 | phte[base + i].vsid = vsid; |
204 | phte[base + i].vsid = vsid; |
| 190 | phte[base + i].h = h; |
205 | phte[base + i].h = h; |
| 191 | phte[base + i].api = api; |
206 | phte[base + i].api = api; |
| 192 | phte[base + i].rpn = pte->pfn; |
207 | phte[base + i].rpn = pte->pfn; |
| Line 195... | Line 210... | ||
| 195 | phte[base + i].wimg = (pte->page_cache_disable ? WIMG_NO_CACHE : 0); |
210 | phte[base + i].wimg = (pte->page_cache_disable ? WIMG_NO_CACHE : 0); |
| 196 | phte[base + i].pp = 2; // FIXME |
211 | phte[base + i].pp = 2; // FIXME |
| 197 | } |
212 | } |
| 198 | 213 | ||
| 199 | 214 | ||
| 200 | static void pht_real_insert(const uintptr_t vaddr, const pfn_t pfn) |
- | |
| 201 | { |
- | |
| 202 | uint32_t page = (vaddr >> 12) & 0xffff; |
- | |
| 203 | uint32_t api = (vaddr >> 22) & 0x3f; |
- | |
| 204 | - | ||
| 205 | uint32_t vsid; |
- | |
| 206 | asm volatile ( |
- | |
| 207 | "mfsrin %0, %1\n" |
- | |
| 208 | : "=r" (vsid) |
- | |
| 209 | : "r" (vaddr) |
- | |
| 210 | ); |
- | |
| 211 | - | ||
| 212 | uint32_t sdr1; |
- | |
| 213 | asm volatile ( |
- | |
| 214 | "mfsdr1 %0\n" |
- | |
| 215 | : "=r" (sdr1) |
- | |
| 216 | ); |
- | |
| 217 | phte_t *phte_physical = (phte_t *) (sdr1 & 0xffff0000); |
- | |
| 218 | - | ||
| 219 | /* Primary hash (xor) */ |
- | |
| 220 | uint32_t h = 0; |
- | |
| 221 | uint32_t hash = vsid ^ page; |
- | |
| 222 | uint32_t base = (hash & 0x3ff) << 3; |
- | |
| 223 | uint32_t i; |
- | |
| 224 | bool found = false; |
- | |
| 225 | - | ||
| 226 | /* Find unused or colliding PTE in PTEG */ |
- | |
| 227 | for (i = 0; i < 8; i++) { |
- | |
| 228 | if ((!phte_physical[base + i].v) || |
- | |
| 229 | ((phte_physical[base + i].vsid == vsid) |
- | |
| 230 | && (phte_physical[base + i].api == api) |
- | |
| 231 | && (phte_physical[base + i].h == 0))) { |
- | |
| 232 | found = true; |
- | |
| 233 | break; |
- | |
| 234 | } |
- | |
| 235 | } |
- | |
| 236 | - | ||
| 237 | if (!found) { |
- | |
| 238 | /* Secondary hash (not) */ |
- | |
| 239 | uint32_t base2 = (~hash & 0x3ff) << 3; |
- | |
| 240 | - | ||
| 241 | /* Find unused or colliding PTE in PTEG */ |
- | |
| 242 | for (i = 0; i < 8; i++) { |
- | |
| 243 | if ((!phte_physical[base2 + i].v) || |
- | |
| 244 | ((phte_physical[base2 + i].vsid == vsid) |
- | |
| 245 | && (phte_physical[base2 + i].api == api) |
- | |
| 246 | && (phte_physical[base2 + i].h == 1))) { |
- | |
| 247 | found = true; |
- | |
| 248 | base = base2; |
- | |
| 249 | h = 1; |
- | |
| 250 | break; |
- | |
| 251 | } |
- | |
| 252 | } |
- | |
| 253 | - | ||
| 254 | if (!found) { |
- | |
| 255 | i = page % 8; |
- | |
| 256 | base = base2; |
- | |
| 257 | h = 1; |
- | |
| 258 | } |
- | |
| 259 | } |
- | |
| 260 | - | ||
| 261 | phte_physical[base + i].v = 1; |
- | |
| 262 | phte_physical[base + i].vsid = vsid; |
- | |
| 263 | phte_physical[base + i].h = h; |
- | |
| 264 | phte_physical[base + i].api = api; |
- | |
| 265 | phte_physical[base + i].rpn = pfn; |
- | |
| 266 | phte_physical[base + i].r = 0; |
- | |
| 267 | phte_physical[base + i].c = 0; |
- | |
| 268 | phte_physical[base + i].wimg = 0; |
- | |
| 269 | phte_physical[base + i].pp = 2; // FIXME |
- | |
| 270 | } |
- | |
| 271 | - | ||
| 272 | - | ||
| 273 | /** Process Instruction/Data Storage Interrupt |
215 | /** Process Instruction/Data Storage Interrupt |
| 274 | * |
216 | * |
| 275 | * @param n Interrupt vector number. |
217 | * @param n Interrupt vector number. |
| 276 | * @param istate Interrupted register context. |
218 | * @param istate Interrupted register context. |
| 277 | * |
219 | * |
| Line 334... | Line 276... | ||
| 334 | * |
276 | * |
| 335 | * @param n Interrupt vector number. |
277 | * @param n Interrupt vector number. |
| 336 | * @param istate Interrupted register context. |
278 | * @param istate Interrupted register context. |
| 337 | * |
279 | * |
| 338 | */ |
280 | */ |
| 339 | bool pht_real_refill(int n, istate_t *istate) |
281 | bool pht_refill_real(int n, istate_t *istate) |
| 340 | { |
282 | { |
| 341 | uintptr_t badvaddr; |
283 | uintptr_t badvaddr; |
| 342 | 284 | ||
| 343 | if (n == VECTOR_DATA_STORAGE) |
285 | if (n == VECTOR_DATA_STORAGE) |
| 344 | badvaddr = istate->dar; |
286 | badvaddr = istate->dar; |
| Line 349... | Line 291... | ||
| 349 | asm volatile ( |
291 | asm volatile ( |
| 350 | "mfsprg3 %0\n" |
292 | "mfsprg3 %0\n" |
| 351 | : "=r" (physmem) |
293 | : "=r" (physmem) |
| 352 | ); |
294 | ); |
| 353 | 295 | ||
| 354 | if ((badvaddr >= PA2KA(0)) && (badvaddr < PA2KA(physmem))) { |
296 | if ((badvaddr < PA2KA(0)) || (badvaddr >= PA2KA(physmem))) |
| - | 297 | return false; |
|
| - | 298 | ||
| - | 299 | uint32_t page = (badvaddr >> 12) & 0xffff; |
|
| 355 | pht_real_insert(badvaddr, KA2PA(badvaddr) >> 12); |
300 | uint32_t api = (badvaddr >> 22) & 0x3f; |
| - | 301 | ||
| - | 302 | uint32_t vsid; |
|
| - | 303 | asm volatile ( |
|
| - | 304 | "mfsrin %0, %1\n" |
|
| - | 305 | : "=r" (vsid) |
|
| - | 306 | : "r" (badvaddr) |
|
| - | 307 | ); |
|
| - | 308 | ||
| - | 309 | uint32_t sdr1; |
|
| - | 310 | asm volatile ( |
|
| - | 311 | "mfsdr1 %0\n" |
|
| - | 312 | : "=r" (sdr1) |
|
| - | 313 | ); |
|
| - | 314 | phte_t *phte_real = (phte_t *) (sdr1 & 0xffff0000); |
|
| - | 315 | ||
| - | 316 | /* Primary hash (xor) */ |
|
| - | 317 | uint32_t h = 0; |
|
| - | 318 | uint32_t hash = vsid ^ page; |
|
| - | 319 | uint32_t base = (hash & 0x3ff) << 3; |
|
| - | 320 | uint32_t i; |
|
| - | 321 | bool found = false; |
|
| - | 322 | ||
| - | 323 | /* Find unused or colliding PTE in PTEG */ |
|
| - | 324 | for (i = 0; i < 8; i++) { |
|
| - | 325 | if ((!phte_real[base + i].v) || |
|
| - | 326 | ((phte_real[base + i].vsid == vsid) |
|
| - | 327 | && (phte_real[base + i].api == api) |
|
| - | 328 | && (phte_real[base + i].h == 0))) { |
|
| 356 | return true; |
329 | found = true; |
| - | 330 | break; |
|
| - | 331 | } |
|
| 357 | } |
332 | } |
| 358 | 333 | ||
| - | 334 | if (!found) { |
|
| - | 335 | /* Secondary hash (not) */ |
|
| - | 336 | uint32_t base2 = (~hash & 0x3ff) << 3; |
|
| - | 337 | ||
| - | 338 | /* Find unused or colliding PTE in PTEG */ |
|
| - | 339 | for (i = 0; i < 8; i++) { |
|
| - | 340 | if ((!phte_real[base2 + i].v) || |
|
| - | 341 | ((phte_real[base2 + i].vsid == vsid) |
|
| - | 342 | && (phte_real[base2 + i].api == api) |
|
| - | 343 | && (phte_real[base2 + i].h == 1))) { |
|
| - | 344 | found = true; |
|
| - | 345 | base = base2; |
|
| - | 346 | h = 1; |
|
| - | 347 | break; |
|
| - | 348 | } |
|
| - | 349 | } |
|
| - | 350 | ||
| - | 351 | if (!found) { |
|
| - | 352 | /* Use secondary hash to avoid collisions |
|
| - | 353 | with usual PHT refill handler. */ |
|
| - | 354 | i = RANDI(seed_real) % 8; |
|
| - | 355 | base = base2; |
|
| - | 356 | h = 1; |
|
| - | 357 | } |
|
| - | 358 | } |
|
| - | 359 | ||
| - | 360 | phte_real[base + i].v = 1; |
|
| - | 361 | phte_real[base + i].vsid = vsid; |
|
| - | 362 | phte_real[base + i].h = h; |
|
| - | 363 | phte_real[base + i].api = api; |
|
| - | 364 | phte_real[base + i].rpn = KA2PA(badvaddr) >> 12; |
|
| - | 365 | phte_real[base + i].r = 0; |
|
| - | 366 | phte_real[base + i].c = 0; |
|
| - | 367 | phte_real[base + i].wimg = 0; |
|
| - | 368 | phte_real[base + i].pp = 2; // FIXME |
|
| - | 369 | ||
| 359 | return false; |
370 | return true; |
| 360 | } |
371 | } |
| 361 | 372 | ||
| 362 | 373 | ||
| 363 | void tlb_arch_init(void) |
374 | void tlb_arch_init(void) |
| 364 | { |
375 | { |
| Line 436... | Line 447... | ||
| 436 | asm volatile ( |
447 | asm volatile ( |
| 437 | "mfsrin %0, %1\n" |
448 | "mfsrin %0, %1\n" |
| 438 | : "=r" (vsid) |
449 | : "=r" (vsid) |
| 439 | : "r" (sr << 28) |
450 | : "r" (sr << 28) |
| 440 | ); |
451 | ); |
| 441 | printf("vsid[%d]: VSID=%.*p (ASID=%d)%s%s\n", sr, |
452 | printf("sr[%02u]: vsid=%.*p (asid=%u)%s%s\n", sr, |
| 442 | sizeof(vsid) * 2, vsid & 0xffffff, (vsid & 0xffffff) >> 4, |
453 | sizeof(vsid) * 2, vsid & 0xffffff, (vsid & 0xffffff) >> 4, |
| 443 | ((vsid >> 30) & 1) ? " supervisor" : "", |
454 | ((vsid >> 30) & 1) ? " supervisor" : "", |
| 444 | ((vsid >> 29) & 1) ? " user" : ""); |
455 | ((vsid >> 29) & 1) ? " user" : ""); |
| 445 | } |
456 | } |
| 446 | 457 | ||